diff --git a/support/mesh/mesh_protobuf/src/protofile/mod.rs b/support/mesh/mesh_protobuf/src/protofile/mod.rs
index 24812e9cb2..d03009b2c7 100644
--- a/support/mesh/mesh_protobuf/src/protofile/mod.rs
+++ b/support/mesh/mesh_protobuf/src/protofile/mod.rs
@@ -113,6 +113,7 @@ pub struct FieldType<'a> {
     annotation: &'a str,
 }
 
+#[cfg_attr(not(feature = "std"), expect(dead_code))]
 #[derive(Debug, Copy, Clone)]
 enum SequenceType<'a> {
     Optional,
@@ -120,6 +121,7 @@ enum SequenceType<'a> {
     Map(&'a str),
 }
 
+#[cfg_attr(not(feature = "std"), expect(dead_code))]
 #[derive(Debug, Copy, Clone)]
 enum FieldKind<'a> {
     Builtin(&'a str),
@@ -291,6 +293,7 @@ impl<'a> FieldType<'a> {
 }
 
 /// A descriptor for a message field.
+#[cfg_attr(not(feature = "std"), expect(dead_code))]
 #[derive(Debug, Copy, Clone)]
 pub struct FieldDescriptor<'a> {
     field_type: FieldType<'a>,
@@ -317,6 +320,7 @@ impl<'a> FieldDescriptor<'a> {
 }
 
 /// A description of a protobuf `oneof`.
+#[cfg_attr(not(feature = "std"), expect(dead_code))]
 #[derive(Debug, Copy, Clone)]
 pub struct OneofDescriptor<'a> {
     name: &'a str,
@@ -332,6 +336,7 @@ impl<'a> OneofDescriptor<'a> {
 
 /// A message descriptor.
 #[derive(Debug, Copy, Clone)]
+#[cfg_attr(not(feature = "std"), expect(dead_code))]
 pub struct MessageDescriptor<'a> {
     comment: &'a str,
     name: &'a str,
diff --git a/support/mesh/mesh_protobuf/src/time.rs b/support/mesh/mesh_protobuf/src/time.rs
index e7f34bb05d..90a832e5ce 100644
--- a/support/mesh/mesh_protobuf/src/time.rs
+++ b/support/mesh/mesh_protobuf/src/time.rs
@@ -18,6 +18,7 @@ use crate::table::DescribeTable;
 use crate::table::TableEncoder;
 use core::time::Duration;
 use mesh_protobuf::Protobuf;
+#[cfg(feature = "std")]
 use thiserror::Error;
 
 const NANOS_PER_SEC: u32 = 1_000_000_000;
@@ -66,6 +67,7 @@ impl From<std::time::SystemTime> for Timestamp {
     }
 }
 
+#[cfg(feature = "std")]
 #[derive(Debug, Error)]
 #[error("timestamp out of range for system time")]
 pub struct TimestampOutOfRange;